SwiftUI previews are powerful tools that help us to see our views live. However, it is tricky to manage local storage-related views with previews, most of the time, you might need to create entity instance to be able to run a preview.
Core data is a great API for leveraging local storage requirements, supports objective-oriented declarations, and provides neat functionalities. In a modern application, we might need to have some app extensions such as widget extension or share extension.
Subscript is powerful API for accessing or settings elements of a collection, list, or sequence that can be defined with classes, structures, and enumerations.